Fracture Toughness of 304 Stainless Steel in High Magnetic Fields at Cryogenic Temperature
Fracture toughness tests were made on 304 stainless steel at 4 K, varying the precracking temperature (300 K and 77 K) and magnetic field (0 T and 8 T). The obtained results are discussed, taking the TRIP* effect and the promotion of martensite formation in magnetic fields into consideration.
Fracture toughness values (JIC) of 43 — 62 kJ/m2 and tearing modulus values (Tmat) of 11 — 20 were obtained under various test conditions. The highest values of JIC and Tmat were obtained for cases in which a remarkable TRIP effect was expected. Low values of Tmat were obtained in cases of applying a magnetic field (8 T). The acceleration of martensite formation in the magnetic field might be considered to result in such low values of Tmat in these cases.
KeywordsMagnetic Field Fracture Toughness Crack Opening Displacement High Magnetic Field Cryogenic Temperature
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